#include "apue.h"
#include <ctype.h>

int 
main(void) {
	int c;
	while ((c = getchar()) != EOF) {
		if (isupper(c)) {
			c = tolower(c);
		}
		if (putchar(c) == EOF) {
			err_sys("output error");
		}
		if (c == '\n') {
			fflush(stdout);
		}
	}
	exit(0);
}
